What type of coating can be used to address flue gas corrosion in the heat exchange tubes of air preheaters in flue gas systems?
Thread Content
Flue gas corrosion of the heat exchange tubes in the air preheater of the boiler’s flue gas system causes soot to accumulate on the surface of these tubes along with corrosion, which further damages the tubes and reduces the service life of the preheater. Are there any good ways to solve this kind of problem?
To address the corrosion issue of the heat exchange tubes in the air preheater of boiler flue gas systems, high-temperature corrosion-resistant coatings can be applied to these tubes. This coating can form a protective layer in high-temperature environments, preventing the acidic components and other harmful substances in flue gas from directly corroding the metal surface, thereby extending the service life of the preheater. Coatings that are resistant to high temperatures and corrosion should be selected, and it is necessary to ensure that the coating is even and complete in order to achieve the best protective effect. .
I have used spraying. The effect is quite noticeable.
Fluorine-based material heat exchangers can be used; they are corrosion-resistant and do not scale
The components of flue gas can sometimes be acidic, or the environment may be characterized by high humidity and high temperatures; in such cases, stainless steel 304 can be used, with 316 being a better choice. For even higher temperatures, 316L is suitable, although it is more expensive. Graphite is used in environments with severe corrosion, but given the composition of your flue gas, graphite is likely not necessary